Tube or Röhre ID, Triode, vacuum, Nuvistor and Universal shown. Radio tubes are valves. Find great deals for NOS Vacuum Tube Jan RCA Nuvistor. Shop with confidence on eBay!. The nuvistor is a type of vacuum tube announced by RCA in Most nuvistors are basically – First one released, medium mu triode; – Sharp cutoff tetrode; – triode for low plate voltages; – triode, with plate cap & grid.

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In the mids the Knight range of quality receivers and amplifiers were offered as kits in the UK, by Electroniques.

The valve was compact, at 37mm tall excluding pins, and its 6. Nuvistors were not only used by NASA in space: The case itself is often connected to the grid of the valve, making it relatively easy to get a good ground connection in grounded-grid circuits. Note that there are no mica spacers used nuvistkr support and separate internal structures, as in ‘normal’ valves.

@ The Valve Museum

Referring to this diagram will help identify the component parts of the 6CW4 shown above. Above, left, is an example of the first released Nuvistor type, themanufactured by Philips at Eindhoven and branded ‘Mullard’ for the U.

There may be ones I’ve missed, especially ‘special quality’ ones designed for rugged industrial applications. Could RCA have developed a glass-based miniature valve with most of the attributes needed for use in TV tuners, and nuvkstor the considerable tooling costs of putting the brand new mechanical design of the Nuvistor into production? Triodes and a few tetrodes were made. The valve was equivalent to the and the CV Published by RCA in September Nuvistors have very low nuviztor electrode capacitances and transit times which means they are usable at VHF and low UHF frequencies, where they considerably out performed the transistors then available.

Two lugs ‘large’ and ‘small’ adjacent to pins 2 and 4 locate the valve in its socket, which is shown alongside. Rangers 7, 8 and 9 redesigned from the initial craft and launched in and were successes and as they hurtled towards their destiny of crashing into the Moon sent back detailed images from their six cameras, which were extremely useful for planning the Apollo Moon-landing missions.

7586 NOS Vacuum Tube Jan RCA Nuvistor

Mullard’s diagram of the internal structure of a Nuvistor helps work out which parts of the ‘de-capped’ 6CW4 do what. RCA’s semiconductor division was doing well and intimately involved with transistor and integrated circuit development and manufacture. Heater power nuvostor less than 1W was achieved for most Nuvistors, and with nyvistor anode voltages in the range V and even lower in some specialised applicationsHT power consumption could also be kept low. RCA nuvitsor the word nuvidtor, this being the process of designing Nuvistors into new equipment.


A brief history of the RCA Company. I’m not sure how prospective constructors could get hold of the special socket for their Nuvistor, so this was a challenge in itself. In the US Space Program The Ranger series of unmanned spacecraft were launched between andand were the first US attempt to obtain close-up images of the Moon’s surface, in preparation for the manned landings at the end of the decade, as pledged by President Kennedy in There is plenty of Nuvistor data on the Internet.

This must have been quite tricky as it had to preserve the vacuum as the valve’s case warms up and cools down in service. Unlike in a glass-based valve there is no getter structure, whose function is to eliminate the last traces of any remaining gasses after the valve has been evacuated and sealed.

Making nuvistors requires special equipment, since there is no intubation to pump gases out of the envelope. These direct connections help reduce lead inductance and hence improve high frequency performance. If you search for ‘nuvistor project’ on Google you’ll get lots of hits for audio and radio projects that you might want to build. This solved any obsolescence issue as the was obtainable everywhere, and could easily be replaced if necessary as it was mounted in a socket.

Although mica is a very good insulator and capable of withstanding the high temperatures inside valves, it is brittle and can be a source of failure if the mica discs de-laminate or splinter. RCA discontinued their use in television tuners for its product line in late Commons category link is on Wikidata. Developmental models now being tried out by designers will have a profound effect on the size, appearance, and performance of electronic equipment for entertainment, communications, defense, and industry in the future.

The Ranger series of unmanned spacecraft were launched between andand were the first US attempt to obtain close-up images of the Moon’s surface, in preparation for the manned landings at the end of the decade, as pledged by President Kennedy in Retrieved from ” https: Another competing valve was the E88CC which in theory should have been numbered as the ECC88, but the special quality of the valve was indicated in the Mullard coding system by the numbers being presented immediately after the ‘E’ twin triode service code CVagain in a B9A envelope, and with a 6.


Before returning the plane to its rightful owners in 30 crates the Americans took it apart and analysed its technology in great detail. Its excellent VHF and UHF performance plus low noise figure made it a good choice when compared to competing valves or transistors of the day. The circuits were crude by today’s standards – they contained several transistors and a few resistors, but they were the first step on the road that has led to billions of transistors now being regularly deposited onto a single silicon chip.

I may have bent the anode carrier slightly when removing the case.

These Russian wire-ended valves have the advantage that they do not need a socket, which in a high-reliability application such as a military aircraft is a major source of failure, and can be wired directly into circuit. One famous audio application of the Nuvistor was in the mids Ampex MR, a costly studio-grade 1-inch 4-track tape recorder whose entire electronics section was based on nhvistor and push-pull pairs of tetrodes.

The valve is made of metal and ceramic, which needed special manufacturing techniques beyond the molten glass handling and high vacuum technology more normally used for valve manufacture, which results in very low losses at high frequencies. One famous application was in the Ampex MR, a costly studio tape recorder whose entire electronics section was based on nuvistors.

The tube is made entirely of metal and ceramic. Other applications included high-quality studio microphones, tape recorders, FM radio front ends, amateur radio equipment, and most significantly, military and space equipment.

Conventional wisdom indicates that valves help to ‘nuclear-proof’ receiver front ends: In a RCA advert the company claimed: It is another example of the way RCA is constantly advancing in electronics. The tetrode grid number 1 connection is made via the metal shell, giving a solid low inductance connection to the chassis in grounded-grid amplifiers.